The TTSX has a larger hollow point behind the plastic tip

338 bullets
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Plus it reduces or eliminates detritus that is left from the manufacturing process in the hollow point on the TSX's

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IMO that makes the TTSX a more reliable expander

Accuracy has been the same in my rifles

"The beauty of the 2nd amendment is that it will not be needed until they try to take it" - Thomas Jefferson

Criminals prefer unarmed victims and dictators prefer unarmed citizens